Two protocols for the organocatalyzed decarboxylative trichloromethylation of Morita–Baylis–Hillman (MBH) substrates have been developed. Applying sodium trichloroacetate, as the trichloromethyl anion precursor, in combination with an organocatalyst and acetylated MBH‐alcohols, the desired trichloromethylated products were obtained in good yields at room temperature in batch. The method was next extrapolated
已经开发出两种用于Morita–Baylis–Hillman(MBH)底物的有机催化
脱羧三
氯甲基化的方案。将
三氯乙酸钠作为三
氯甲基阴离子的前体,与有机
催化剂和乙酰化的MBH-醇结合使用,可以在室温下分批批量获得所需的三
氯甲基化产物。接下来将该方法外推到两步连续流方案中,直接从MBH醇开始,与同时用作碱和
催化剂的
三丁胺结合使用。事实证明,该流动过程优于分批方法,将反应时间从16小时减少到仅20分钟,并且所有调查项目的收率均得到提高。还采用了两个示例来扩大流量,以产生超过10克的两个三
氯甲基化靶标。最后,2 PHAL或(
DHQD)2 PHAL在反应中诱导手性转移至生成的立体中心,并具有接近90%ee的选择性 。